# Claude Sonnet 5.5 vs Mercury

> Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 37.3 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-sonnet-5-5-vs-mercury
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in reasoning, where Claude Sonnet 5.5 leads 52.4 to 16.8.

## Snapshot

| | Claude Sonnet 5.5 | Mercury |
|---|---|---|
| Provider | Anthropic | Inception |
| Noometry Index | 60.5 | 37.3 |
| Rank | 10 | 192 |
| Context | 1M | — |
| Input $/M | $2 | — |
| Output $/M | $10 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Sonnet 5.5: 65.5 (#6)
- Mercury: 38.1 (#164)

| Benchmark | Claude Sonnet 5.5 | Mercury |
|---|---|---|
| FrontierCode | 52.1% | — |
| CursorBench | 55.5% | — |
| LMArena WebDev | 1699 | — |
| FrontierSWE | 61.9% | — |
| SciCode | 61% | — |
| LMArena Coding | — | 1323 |
| ALE-Bench | 1,819 | — |

## Agentic & Tool Use

- Claude Sonnet 5.5: 44.9 (#14)
- Mercury: —

| Benchmark | Claude Sonnet 5.5 | Mercury |
|---|---|---|
| APEX-Agents | 75.5% | — |

## Reasoning

- Claude Sonnet 5.5: 52.4 (#29)
- Mercury: 16.8 (#288)

| Benchmark | Claude Sonnet 5.5 | Mercury |
|---|---|---|
| Kagi LLM Benchmark | — | 21.6% |
| CritPt | 31.4% | — |
| LMArena Hard Prompts | — | 1284 |
| Mystery Game Puzzles | 65% | — |

## Math

- Claude Sonnet 5.5: 88.7 (#4)
- Mercury: —

| Benchmark | Claude Sonnet 5.5 | Mercury |
|---|---|---|
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |

## Knowledge

- Claude Sonnet 5.5: 66.0 (#11)
- Mercury: —

| Benchmark | Claude Sonnet 5.5 | Mercury |
|---|---|---|
| GPQA Diamond | 95.6% | — |
| SimpleQA Verified | 46.5% | — |

## Multimodal

- Claude Sonnet 5.5: 53.2 (#5)
- Mercury: —

| Benchmark | Claude Sonnet 5.5 | Mercury |
|---|---|---|
| Furniture Assembly | 75% | — |

## Multilingual

- Claude Sonnet 5.5: —
- Mercury: 41.7 (#201)

| Benchmark | Claude Sonnet 5.5 | Mercury |
|---|---|---|
| LMArena Non-English | — | 1259 |

## Instruction Following

- Claude Sonnet 5.5: —
- Mercury: 65.3 (#220)

| Benchmark | Claude Sonnet 5.5 | Mercury |
|---|---|---|
| LMArena Instruction Following | — | 1238 |

## Long Context

- Claude Sonnet 5.5: —
- Mercury: 38.3 (#193)

| Benchmark | Claude Sonnet 5.5 | Mercury |
|---|---|---|
| LMArena Longer Query | — | 1264 |

## Writing & Preference

- Claude Sonnet 5.5: —
- Mercury: 46.2 (#216)

| Benchmark | Claude Sonnet 5.5 | Mercury |
|---|---|---|
| LMArena Text | — | 1282 |
| LMArena Creative Writing | — | 1186 |
| LMArena Multi-Turn | — | 1283 |

## FAQ

### Is Claude Sonnet 5.5 better than Mercury?

Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 37.3 on the Noometry Index.

### Is Claude Sonnet 5.5 or Mercury better for coding?

Claude Sonnet 5.5 scores higher on coding benchmarks: 65.5 versus 38.1 in the Noometry coding category.

### How many benchmarks do Claude Sonnet 5.5 and Mercury share?

0 benchmarks have published results for both models. Claude Sonnet 5.5 has 16 scored results on Noometry and Mercury has 9.